trigonometry

Question: In$\Delta ABC,$ if $2(bc\cos A+ca\cos B+ab\cos C)=$



1) 0
2) $a+b+c$
3) ${{a}^{2}}+{{b}^{2}}+{{c}^{2}}$
4) None of these
Solution: Explanation: No Explanation
Relation between sides and angles Solutions of triangles

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